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fix: run 404 分级降级重试(先丢会话带摘要,再重建工作区迁移)

feat: 会话状态落盘(sessions.json)+/recover 找回云端会话+run创建即缓存工作区

feat: 换key自愈(工作区迁移+会话前情提要)+任务环境前缀(自装Node)

fix: 工作区 404 自愈（key 轮换后跨账号 workspace not found 自动重建重试）

Add TG_API_BASE option + HTTP:80 diagnostic

Add startup network diagnostics (urllib/httpx/proxy/BU API)

Force IPv4 (DNS/v6 hang fix) + boot observability in health endpoint

Fix startup timeouts (30s + infinite bootstrap retry); add keep-alive self-ping

Add workspace file features (/files, /get, file upload); 654-key pool

Remove old app file telegram_bot.py

Remove old app file requirements.txt

Remove old app file processor.py